Solve the system of linear equations in two variables by elimination or substitution. 3x+y=7 -2x-y=9

Evaluate the expression for the given value of the variable 2×(c2-5) for c=4

Lv beethoven software supplies customized software to a managed healthcare system. lv beethoven software's costs for the software is $1,723,000. lv beethoven software sells the software to the healthcare system for $3,816,981.10. overhead expenses are estimated at 47% of the selling price. what is lv beethoven software's net profit to the nearest dollar?

Solve for x and select the correct answer